/*

This file is part of Ext JS 4

Copyright (c) 2011 Sencha Inc

Contact:  http://www.sencha.com/contact

Commercial Usage
Licensees holding valid commercial licenses may use this file in accordance with the Commercial Software License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Sencha.

If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.

*/
/**
 * @class Ext.chart.theme.Theme
 * 
 * Provides chart theming.
 * 
 * Used as mixins by Ext.chart.Chart.
 */
Ext.define('Ext.chart.theme.Theme', {

    /* Begin Definitions */

    requires: ['Ext.draw.Color'],

    /* End Definitions */

    theme: 'Base',
    themeAttrs: false,
    
    initTheme: function(theme) {
        var me = this,
            themes = Ext.chart.theme,
            key, gradients;
        if (theme) {
            theme = theme.split(':');
            for (key in themes) {
                if (key == theme[0]) {
                    gradients = theme[1] == 'gradients';
                    me.themeAttrs = new themes[key]({
                        useGradients: gradients
                    });
                    if (gradients) {
                        me.gradients = me.themeAttrs.gradients;
                    }
                    if (me.themeAttrs.background) {
                        me.background = me.themeAttrs.background;
                    }
                    return;
                }
            }
            //<debug>
            Ext.Error.raise('No theme found named "' + theme + '"');
            //</debug>
        }
    }
}, 
// This callback is executed right after when the class is created. This scope refers to the newly created class itself
function() {
   /* Theme constructor: takes either a complex object with styles like:
  
   {
        axis: {
            fill: '#000',
            'stroke-width': 1
        },
        axisLabelTop: {
            fill: '#000',
            font: '11px Arial'
        },
        axisLabelLeft: {
            fill: '#000',
            font: '11px Arial'
        },
        axisLabelRight: {
            fill: '#000',
            font: '11px Arial'
        },
        axisLabelBottom: {
            fill: '#000',
            font: '11px Arial'
        },
        axisTitleTop: {
            fill: '#000',
            font: '11px Arial'
        },
        axisTitleLeft: {
            fill: '#000',
            font: '11px Arial'
        },
        axisTitleRight: {
            fill: '#000',
            font: '11px Arial'
        },
        axisTitleBottom: {
            fill: '#000',
            font: '11px Arial'
        },
        series: {
            'stroke-width': 1
        },
        seriesLabel: {
            font: '12px Arial',
            fill: '#333'
        },
        marker: {
            stroke: '#555',
            fill: '#000',
            radius: 3,
            size: 3
        },
        seriesThemes: [{
            fill: '#C6DBEF'
        }, {
            fill: '#9ECAE1'
        }, {
            fill: '#6BAED6'
        }, {
            fill: '#4292C6'
        }, {
            fill: '#2171B5'
        }, {
            fill: '#084594'
        }],
        markerThemes: [{
            fill: '#084594',
            type: 'circle' 
        }, {
            fill: '#2171B5',
            type: 'cross'
        }, {
            fill: '#4292C6',
            type: 'plus'
        }]
    }
  
  ...or also takes just an array of colors and creates the complex object:
  
  {
      colors: ['#aaa', '#bcd', '#eee']
  }
  
  ...or takes just a base color and makes a theme from it
  
  {
      baseColor: '#bce'
  }
  
  To create a new theme you may add it to the Themes object:
  
  Ext.chart.theme.MyNewTheme = Ext.extend(Object, {
      constructor: function(config) {
          Ext.chart.theme.call(this, config, {
              baseColor: '#mybasecolor'
          });
      }
  });
  
  //Proposal:
  Ext.chart.theme.MyNewTheme = Ext.chart.createTheme('#basecolor');
  
  ...and then to use it provide the name of the theme (as a lower case string) in the chart config.
  
  {
      theme: 'mynewtheme'
  }
 */

(function() {
    Ext.chart.theme = function(config, base) {
        config = config || {};
        var i = 0, l, colors, color,
            seriesThemes, markerThemes,
            seriesTheme, markerTheme, 
            key, gradients = [],
            midColor, midL;
        
        if (config.baseColor) {
            midColor = Ext.draw.Color.fromString(config.baseColor);
            midL = midColor.getHSL()[2];
            if (midL < 0.15) {
                midColor = midColor.getLighter(0.3);
            } else if (midL < 0.3) {
                midColor = midColor.getLighter(0.15);
            } else if (midL > 0.85) {
                midColor = midColor.getDarker(0.3);
            } else if (midL > 0.7) {
                midColor = midColor.getDarker(0.15);
            }
            config.colors = [ midColor.getDarker(0.3).toString(),
                              midColor.getDarker(0.15).toString(),
                              midColor.toString(),
                              midColor.getLighter(0.15).toString(),
                              midColor.getLighter(0.3).toString()];

            delete config.baseColor;
        }
        if (config.colors) {
            colors = config.colors.slice();
            markerThemes = base.markerThemes;
            seriesThemes = base.seriesThemes;
            l = colors.length;
            base.colors = colors;
            for (; i < l; i++) {
                color = colors[i];
                markerTheme = markerThemes[i] || {};
                seriesTheme = seriesThemes[i] || {};
                markerTheme.fill = seriesTheme.fill = markerTheme.stroke = seriesTheme.stroke = color;
                markerThemes[i] = markerTheme;
                seriesThemes[i] = seriesTheme;
            }
            base.markerThemes = markerThemes.slice(0, l);
            base.seriesThemes = seriesThemes.slice(0, l);
        //the user is configuring something in particular (either markers, series or pie slices)
        }
        for (key in base) {
            if (key in config) {
                if (Ext.isObject(config[key]) && Ext.isObject(base[key])) {
                    Ext.apply(base[key], config[key]);
                } else {
                    base[key] = config[key];
                }
            }
        }
        if (config.useGradients) {
            colors = base.colors || (function () {
                var ans = [];
                for (i = 0, seriesThemes = base.seriesThemes, l = seriesThemes.length; i < l; i++) {
                    ans.push(seriesThemes[i].fill || seriesThemes[i].stroke);
                }
                return ans;
            })();
            for (i = 0, l = colors.length; i < l; i++) {
                midColor = Ext.draw.Color.fromString(colors[i]);
                if (midColor) {
                    color = midColor.getDarker(0.1).toString();
                    midColor = midColor.toString();
                    key = 'theme-' + midColor.substr(1) + '-' + color.substr(1);
                    gradients.push({
                        id: key,
                        angle: 45,
                        stops: {
                            0: {
                                color: midColor.toString()
                            },
                            100: {
                                color: color.toString()
                            }
                        }
                    });
                    colors[i] = 'url(#' + key + ')'; 
                }
            }
            base.gradients = gradients;
            base.colors = colors;
        }
        /*
        base.axis = Ext.apply(base.axis || {}, config.axis || {});
        base.axisLabel = Ext.apply(base.axisLabel || {}, config.axisLabel || {});
        base.axisTitle = Ext.apply(base.axisTitle || {}, config.axisTitle || {});
        */
        Ext.apply(this, base);
    };
})();
});

